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. 2017 Nov 9;7:15151. doi: 10.1038/s41598-017-15495-2

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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The magnitude of hemispheric lateralization in amygdala, obtained by subtracting the % signal change in the left amygdala from that in the right amygdala for each participant. The magnitude of hemispheric lateralization in amygdala when participants viewed clear fear (averted-gaze fear) faces presented in M-biased (dots in gray) and ambiguous fear (direct-gaze fear) faces presented in P-biased (dots in red-green) are plotted as a function of observers’ trait anxiety. The positive values indicate greater activation in the right amygdala (right hemisphere (RH) dominant) whereas the negative values indicate greater activation in the left amygdala (left hemisphere (LH) dominant). The gray and red lines indicate the linear regressions with trait anxiety for the M-biased and P-biased stimuli, respectively. Solid, thick lines indicate that correlations were statistically significant (FDR adjusted p < 0.05).